Anyone who engages in machining knows that the machining process is advanced, and the allowable error will also occur. Then there is a reasonable fit clearance for the mechanical coordination (otherwise, the mechanically matched machine cannot smoothly move relative) . Since the environment in which the lock is used is complicated, the clearance of the dynamic fit cannot be too small. Otherwise, if there is a foreign matter such as tiny dust or a slight rust oxide, it is enough to make the rotating part of the lock unable to rotate and normally unlock. Locksmiths or those who have removed the lock know that the lock is made up of components such as the lock cylinder , the lock body and the marbles. These are the moving parts. The unlockers use the machining tolerances allowed by these components and the reasonable dynamic fit clearance to achieve the purpose of unlocking with a plucking. The slamming and unlocking tool is a hook or a single hook. Another tool used in conjunction with the hook is another one. Some people also refer to these two matching tools as "universal keys." The so-called hook is nothing more than a slender flat strip of hard steel with pointed hooks of different shapes that can be used to extend into the keyhole to pry the marbles. The so-called other is that one end or both ends are bent at right angles, and the front end is formed into a flat sheet shape, which can be inserted into the lock hole to hold the lock core, so that the lock cylinder can generate a rotating force rod. The Locksmith Store sells a variety of hooks and clips called "Master Key" or "Lily Spoon". The hooks in the kits sold are all stamped from thin steel sheets. I feel thin and wide, have a tremor, are easy to break, and some don't make them easy. Hook making material Hooks can be made by themselves, but professional locksmith supplies are suitable for sale. There are many easy-to-find materials in daily life, or the waste in the factory is very useful for making unlocking tools. (1), steel sheet: Grinding with scrap steel saw blade, this material is brittle, easy to break (can not be processed with steel shovel), the tip of the hook can be burned slightly with a gas stove or a windproof lighter, in fact, there is no big fuss , it wants to do a; umbrellas flat prongs and automotive wiper of thin steel sheet; 8mm wide cut further elongated by about 1mm thick band saw blades, grinding can be carried out It is. (2), steel wire: there are steel bicycle spokes, especially stainless steel spokes, pull wire rod pull wire, steel wire rope wire, there is information to use the 12th thick steel wire, in fact, the thick point is okay, as long as the front end It can be used by tapping with a hammer to the appropriate degree. (3), coiled stainless steel electrode, after tapping the flat to make the tool is good-looking and easy to use. (4), the best material for making hooks, or use large-sized knitted crochet, soft and hard, if you use imported crochet will be better. Used crochet is often found in the waste cotton used in the factory. It can be purchased from knitting machinery stores. I use a knitted crochet that is 2.5mm wide and 1mm thick. 2, the production method Some materials provide hook handle length of 84mm, hook front end length of 37mm, we can refer to these size data when making hooks, but do not stick to these dimensions, we can make according to the actual situation and their own habits. The data does not provide the thickness of the hook. I personally think that the front end of the hook should not be too thin and too long. When the keyhole allows it, it should be as short as possible, as thick as possible. Especially if the root of the hook is thick, it should be thinner from the root to the front end of the hook. Durable and used. The hook experience data is that the root is 1 mm thick and the tip is 0.8 mm thick. Hooks used in some keyholes or very small locks may need to be thinner than this size. If the technique is point-based, the hook end of the hook may be flat. If the technique is based on pulling, the hook end of the hook may be a mountain peak. The hooks on the tip of the mountain are easier to push into the keyhole. There are also hooks of other shapes, such as garden heads and long or multi- toothed ones. It seems that these habits and techniques are not very large, as long as there are raised tools at the front end. The angle of the hook I think should be the same as the angle of the key tooth, so that the hook enters and exits the keyhole. If it is hard to take out the data, it should be in the range of 135°~145°. Similarly, you should not stick to this angle or use any tools to measure the amount, you can test and get used to make hooks suitable for your own use. I think that the angle of the hook is larger and it is suitable to be pulled in the keyhole. The angle of the hook is small and the force is small. If the hook is opened with a hook with too small angle, it is possible to pull the tablet to break the bolt. (1) Steel sheet materials can be rough processed by grinder and then processed with a trowel, and then polished with water sandpaper, which is good-looking and easy to use. (2) The material of the steel wire can be processed into a hook by tapping with a hand hammer, and the hook made of the wire-like material is preferably equipped with a handle to facilitate the control of the direction of the hook. You can bend your favorite handle directly at the other end of the hook, or use an old toothbrush with plexiglass or plastic, or a stronger old pen or ballpoint pen. For materials without holes, a drill bit can be used to drill a hole in the axial direction of the shank that is slightly smaller than the diameter of the hook. Put the completed hook on the vise, insert the handle of the drilled hole into the small hole, and insert the handle with the tool until the hook enters the position. In order to connect the hook to the handle, apply glue to the insertion end of the hook. (3) It is best to make the hooks cold-worked so that the rigidity of the raw materials can be maintained. If hot working is used, the processing is easy, but the heat treatment is not easy to grasp. The hooks made are often not soft or hard and easy to bend or break. (4), the production of other children: the commonly used children are relatively simple, there are information on the 12th wire , the length of about 94mm at each end of each 17mm, bent at both ends into about 60 °, the angle after hammering It becomes larger and can reach about 80°. Also, don't stick to these dimensions, you can flexibly grasp the keyholes. For example, the thickness of the car needs to be large, so the required wire should be thicker, and some of the anti-theft doors have a cover that requires more than 17mm. Long, about 25mm.

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